Water Storage Tanks for Sale: 275 to 1,000+ Gallon Sizing Guide
Capacity, footprint, height and filled weight for 275 to 1,500 gallon plastic water tanks, plus the resin, fitting and site-prep decisions that separate a potable water tank from a chemical tank.
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TL;DR: Size a plastic water tank from three numbers: usable capacity, filled weight, and the footprint your pad can carry. Water weighs 8.34 lb per gallon, so a 1,000-gallon tank puts roughly 8,340 lb on the pad. Potable service requires FDA/NSF-grade resin and an opaque wall.
Quick Facts
| Capacity | Typical diameter | Typical height | Filled weight (water) |
|---|---|---|---|
| 275 gal | 36 in | 68 in | ~2,295 lb |
| 500 gal | 46 in | 78 in | ~4,170 lb |
| 750 gal | 54 in | 82 in | ~6,255 lb |
| 1,000 gal | 64 in | 80 in | ~8,340 lb |
| 1,500 gal | 72 in | 92 in | ~12,510 lb |
| 2,500 gal | 90 in | 100 in | ~20,850 lb |
Dimensions vary by manufacturer and by vertical vs low-profile geometry. Use these as a planning envelope and confirm against the quoted model.
Start With Filled Weight, Not Volume
The number that dictates the pad, the ring-3 wall and the forklift plan is weight:
A 1,500-gallon tank of water is over 6 tons on a circle roughly 6 ft across. That is a concrete pad question, not a container question. Sizing shortcuts here are what cause tank failures — the tank does not fail, the base does.
Potable vs Chemical: Not the Same Tank
| Factor | Potable water tank | Chemical storage tank |
|---|---|---|
| Resin | FDA/NSF-grade virgin HDPE | HDPE or XLPE by compatibility |
| Wall | Opaque, algae-resistant | Often opaque; UV-stabilized |
| Rated specific gravity | 1.0 | 1.5-1.9 depending on model |
| Fittings and gaskets | Potable-rated | Chemical-specific elastomer |
| Vent | Screened | Sized for fill/draw and fumes |
A tank rated only to 1.0 specific gravity will bulge and eventually fail when filled with a denser chemical. Check the rating on the model, not on the family.
Vertical, Low-Profile or Cone Bottom
Fittings, Fill and Draw
Specify these with the order — retrofitting a bulkhead fitting into a molded wall is the most common source of leaks:
Site Prep in Five Lines
Tank, Tote or Bulk Bin
A tank stores in a fixed position. A tote moves on a pallet. A bulk bin handles solids and washdown. If the liquid needs to travel by forklift and trailer, an IBC tote is the correct vessel; if it stays put, a tank costs less per gallon stored. Sizing math for both lives in the tank volume calculator, and the deeper selection detail is in the poly tank sizing and selection guide.
FAQ
How much does a plastic water storage tank cost?
Cost tracks capacity, resin grade, specific-gravity rating, fittings and freight lane — tanks are cube-heavy and freight is often a large share of landed cost. Send capacity, liquid, ship-to ZIP and quantity for a firm quote within 24 hours.
How much does a 1,000 gallon water tank weigh when full?
About 8,340 lb of water plus the tank's dry weight. Plan the pad for at least 8,700 lb over roughly a 64 in diameter circle.
Can I use a chemical tank for drinking water?
No. Potable service requires FDA/NSF-grade resin and potable-rated fittings, and a tank with unknown chemical history cannot be re-qualified for drinking water.
What size tank do I need?
Work from peak daily draw times the number of days of autonomy you need, then add 10-15% freeboard. Two smaller tanks often beat one large one — they fit tighter sites and allow cleaning without shutting the system down.
Do plastic water tanks need to be vented?
Yes. Every closed tank needs a vent sized for the fill and draw rate. Under-venting collapses tanks during pump-out.
Are these tanks UV stable for outdoor use?
Specify a UV-stabilized, opaque wall for outdoor duty. Translucent walls grow algae and degrade faster in sun.
Sources
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Part of the topic guide
IBC Totes and Plastic Storage Tanks: Sizes, Uses and Buying